Results 41 to 50 of about 77,468 (282)
States of low energy in bouncing inflationary scenarios in loop quantum cosmology [PDF]
Physical Review D, 2021 In generic Friedmann-Lema\^itre-Robertson-Walker spacetimes, States of Low Energy (SLEs) are defined to minimize the regularized energy density smeared along the time-like curve of an isotropic observer, which is specified via a smearing function.
M. Mart'in-Benito +2 more
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Analytical investigation of pre-inflationary effects in the primordial power spectrum: from General Relativity to hybrid Loop Quantum Cosmology [PDF]
Journal of Cosmology and Astroparticle Physics, 2021 This work is an analytical study of the main differences between classical inflationary effects of a fast-roll regime and imprints of hybrid Loop Quantum Cosmology (LQC) on the primordial power spectrum.
Beatriz Elizaga Navascués +1 more
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Dynamics of k-essence in loop quantum cosmology * [PDF]
Chinese Physics C, High Energy Physics & Nuclear Physics, 2021 In this paper, we study the dynamics of k-essence in loop quantum cosmology (LQC). The study indicates that the loop quantum gravity (LQG) effect plays a key role only in the early epoch of the universe and is diluted in the later stages.
Jia Shi, Jian-Pin Wu
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Singularities in Loop Quantum Cosmology [PDF]
Physical Review Letters, 2008 5 pages, 3 figures. v2: Comments and references added.
Cailleteau, T. +3 more
openaire +5 more sources
Cosmic Tangle: Loop Quantum Cosmology and CMB Anomalies
Universe, 2021 Loop quantum cosmology is a conflicted field in which exuberant claims of observability coexist with serious objections against the conceptual and physical viability of its current formulations.
Martin Bojowald
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Is a loopy and noncommutative early Universe viable?
Physics Letters B, 2023 We conduct a (pre-)inflationary dynamics study of the chaotic quadratic potential within the framework of a simple noncommutative extension of effective loop quantum cosmology put forward recently.
Luis Rey Díaz-Barrón +3 more
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Tachyon field in loop cosmology
Physics Letters B, 2020 The evolutionary pictures of tachyon field in modified loop cosmology have been investigated. We present the dynamical behavior of the tachyon field associated with an exponential potential and find that the pre-inflation dynamics are very similar in ...
Kui Xiao
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(b,v)-type variables for black to white hole transitions in effective loop quantum gravity
Physics Letters B, 2021 Quantum gravity effects in effective models of loop quantum gravity, such as loop quantum cosmology, are encoded in the choice of so-called polymerisation schemes.
Norbert Bodendorfer +2 more
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Non-oscillating power spectra in loop quantum cosmology [PDF]
Classical and quantum gravity, 2020 We characterize in an analytical way the general conditions that a choice of vacuum state for the cosmological perturbations must satisfy to lead to a power spectrum with no scale-dependent oscillations over time.
B. Navascués +2 more
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Towards a reduced phase space quantization in loop quantum cosmology with an inflationary potential [PDF]
Physical Review D, 2020 We explore a reduced phase space quantization of loop quantum cosmology (LQC) with Gaussian and Brown-Kuchař dust, and massless Klein-Gordon scalar reference fields for a spatially flat FLRW model with a Starobinsky inflationary potential.
K. Giesel, Bao-Fei Li, Parampreet Singh
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